Function nm_device_get_applied_connection_async 

pub unsafe extern "C" fn nm_device_get_applied_connection_async(
    device: *mut NMDevice,
    flags: u32,
    cancellable: *mut GCancellable,
    callback: GAsyncReadyCallback,
    user_data: gpointer,
)

Available on crate feature v1_2 only.